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(a) Ni-coated yarn, and (b) cross-section of a single fiber. (c) Polyacrylonitrile (PAN) nanofiber core-spun yarn at (d) high magnification, and (f) its cross-section. (e) PNF/NiC -24 electrode yarn at (g) high magnification, and (h) a single nanofiber.
